#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int main() {
    char a;
    while ((a = getchar()) != EOF) {
        if (('a' <= a && a <= 'z') || ('A' <= a && a <= 'Z')) {
            printf("%c is an alphabet.\n", a);
        }
        else {
            printf("%c is not an alphabet.\n", a);
        }
        getchar();
    }
}